<form method="post" action="<?php echo site_url('home/login');?>">
    <div class="title"><strong>Username :  <input type="text" name="username" /><br /><br /><br />

    <div class="title">Password :  <input type="password" name="password" /></strong></div><br />

    <div class="input">
       
    </div>
    <div align="right"><div class="input">
        <input type="submit" id="btn_login" value="Login" name="btnLogin" class="button_red" />
    </div></div>
</form>